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Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6

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arxiv 0905.3559 v1 pith:RMVYYXWW submitted 2009-05-21 cond-mat.supr-con

Yiming Qiu , Wei Bao , Yang Zhao , Collin Broholm , V. Stanev , Z. Tesanovic , Y. C. Gasparovic , S. Chang
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Jin Hu Bin Qian Minghu Fang Zhiqiang Mao
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classification cond-mat.supr-con
keywords nestingresonancespinstatefermihbarmagneticsuperconducting
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abstract

Neutron scattering is used to probe magnetic excitations in FeSe_{0.4}Te_{0.6} (T_c=14 K). Low energy spin fluctuations are found with a characteristic wave vector $(0.5,0.5,L)$ that corresponds to Fermi surface nesting and differs from Q_m=(\delta,0,0.5) for magnetic ordering in Fe_{1+y}Te. A spin resonance with \hbar\Omega_0=6.5 meV \approx 5.3 k_BT_c and \hbar\Gamma=1.25 meV develops in the superconducting state from a normal state continuum. We show that the resonance is consistent with a bound state associated with s+/- superconductivity and imperfect quasi-2D Fermi surface nesting.

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  1. Preformed Cooper Pairs in a Triclinic Iron Pnictide Superconductor

    cond-mat.supr-con 2025-01 conditional novelty 6.0 of 10

    In a triclinic iron pnictide superconductor, a spin resonance precursor, Nernst signal, and NMR density-of-states reduction all point to preformed Cooper pairs persisting to T* = 45 K, above Tc = 30 K.

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